General Discussion : Nest Box Substrate

I recently saw a Cornell Lab video of a Kestrel box where the substrate at the bottom of the box was some sort of pebble mix instead of say wood shavings. Is this a better/worse substrate for the eggs or does it work against European Starlings better? I just saw the video and noticed it. 

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Posted in General Discussion by drelys 2 weeks 2 days ago.